What is a great vacation halfway point vacation spot of Illinois and Pennsylvania?

Halfway between Philadelphia and Chicago is Ravenna, OH. Halfway between Pittsburgh and Rock Island is Orland, IN. The distance between Ravenna and Orland is 225 miles, any of which could be a potential halfway spot depending on your starting and ending points. An area of about 10000 square miles centered on Genoa, OH leaves a large number of potential vacation destinations. Without knowing the time of year or interests of the travelers, it's difficult to advise. Rock and roll fans should go to the Hall of Fame in Cleveland. Football fans should go to the Hall of Fame in Canton. The National Aviation Hall of Fame is in Dayton. The Motorcycle Hall of Fame is in Pickerington. The Polka Hall of Fame is in Euclid. The Classical Music Hall of Fame is in Cincinnati. The International Monster Truck Hall of Fame is in Auburn, IN. Wildlife fans can visit the Egypt Valley or Woodbury wildlife areas. Fans of water can take ferries from Catawba Island to the islands of Lake Erie. I would drive the coast of Lake Erie from North East, PA to Toledo, OH with a stop at the African Safari Wildlife Park in Port Clinton. I am sure I would find something of interest.